Hoist.



of the refrigerating-tank.

y UNITED STATES PATENT UFFICE.

` GEORGE o. HUNTEafOF OHTOAGO, ILLINOIS.

Holst.

- `SiPLE(`}II|?ICA.C[ION forming of Letters `Patent No. 723.277, dated March 24, 1903.

Application filed November 22, 1902. Serial No. 132,374. (No model.)

To @ZZ whom t may concern.-

Be it known that I, GEORGEG. HUNTER, a citizen of the UnitedStates of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new 'and useful Improvements in Hoists, of which the following is a specification.

The device in which Iput my invention `into practice is an improved form of hoist which is particularly designed for use in an artiiicial-ice plant for lifting the cans of ice out stood, however, that my device may also be construction shown in the accompanyingA applied to other purposes. The main objects of my invention are to provide an improved form of double cylindrical hoist adapted to be operated by fluidf pressure provided through either a gasor liquid medium and to provide an improved. form of valve connection between the two cylinders. I accomplish these objects by the drawings, in whichinvention.

p `Figure 1 is a longitudinal `partly-sectional view of a hoist constructed according to my Fig. 2 is an end view of same. Fig. 3 is a vertical section of the val\'e and valveseat,taken on the line 3 3 of Fig. 1. Fig.

4 is a similar section taken on theline 4 4 of Fig. 1. Fig. 5 is a front detail view of the Valve-plate operating in connection with the valve-ports shown in Fig. 1, said ports being shown in dotted lines to illustrate the relative Fig. 6 isa vertical sec-.- Fg. 7 is aT horizontal section on the line 7 7.of'Fig. 5. In the device shownthe cylinders l have" therein the pistons 2,- each having an outer i arm 3,v providing abearing for the pulleys 9.

positions of the ports. tion on the line 6 6 of Fig; 5.

Said cylinders are connected at the middle part of the device by the casting 10, forming the valve-seat and` being provided with the Valve-ports 11, 12, 13, and 14. A middle passage lconnects the two cylinders with the `fluid-supply port 11 through a passage 16. `The fluid-supply port 13 is connected with each cylinder at 17 `through the passages 13 and 19. .Atthe middle part of the device and depending` from'thecasting 10 is an arm 20, forming a bearing for the pulleys 2l and 22. A `pair of extensions 23 are secured to the upper part of each cylinder 1, providing bear- It will beA under.-

along the track. A cable 26 passes over the pulley`2'l, and thence over the forward pulley 9. at the right of Fig. l, and continues over the forward pulley 9 at the left of Fig. 1, and thence passes around the other pulleys 9, of which one set is shown in Fig. 2, saidcable continuing over the pulley 22 and engaging the eye 27 toward the right of the equalizing-bar 28. (Shown in Fig. 1.) The bars 29 are of a common form used for lifting cans of ice in refrigerating plants.

The Valve-plate 30 (shown in Figs. 3 to 7, inclusive) has the end 3l of its shaft seated in a suitable bearing in the casting forming the valve-seat 10. The other end of said shaft has a handle 32 rigid thereon, whereby said valve-plate may be turned relatively of the valve-seat. The valve-plate 30 has an opening 33, communicating with the iiexible Huid-inlet 34 through the chamber 35. Said valveplate has on its inner face pockets 36 and 37, so arranged as to establish communication either between the ports 11 and 12 or between the ports 13 and 14. It will be seen that when the valve-plate is turned so asto expose the port 11 to the opening 33 the pocket 37 will establish communication between the ports 13 and'l4. When the valveplate is turned so as to expose the port 13 to the opening 33, then com m unication between the ports 11 and 12 will be established through the pocket 36. .The ports 12 and 14 are eX- haust-ports com n1 unicati n g with the o uter atmosphere.

The operation of the device shown is as follows: When the air or Huid is forced through the flexible connection 34 and port 11 into the passage 15, the fluid will act against the inner ends of the pistons 2, forcing said pistons outwardly, andthus carrying thepulleys 9 outwardly, so as to take up the cable 26, and" thus raise the equalizing-` bar23, with such Weight as may be attached thereto. The valve-plate 30 should at this time have the opening 33 opposite the port '11. The fluid in the outer end of each cylinder will now be forced through the connections 19, the passage 1S, the port 13, the pocket 37,

IOO

A vention.

expose the port 13 to the opening` 33.

and thence through the port 14 to the outer atmosphere. When it is desired to lower the equalizingbar 28 and the weight carried thereby, the operator will,vl by means of the handle 32, turn the valve-plate 30 so atto e iiuid will now be forced into the cylinders at 17, where it will exert pressure to return the pistons toward the position in which they are shown in Fig. 1. The duid at the inner faces of the pistons will now be forced through the passage 15, the port 11, the pocket 36, and the port 12 to the outer atmosphere. When the valve-plate is in the relative position shown in Fig. 5, the ports 11 and 13 Will both be closed and neither of same will be in communication with the exhaust-ports 12 and 14.

It will be understood that some of the details of the construction shown may be altered without departing from the spirit of my in- I therefore do not confine myself to such details, except as hereinafter limited in the claims.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of a pair of connected cylinders; a pair of oppositely-acting pistons, each carrying a pulley at its outer end; a iluidsupply chamber; avalvecommunicating with both the inner and outer ends of said cylinders, and adapted to exhaust the fluid at the outer ends of said cylinders and at the same time admit Huid into their inner ends, and to exhaust 'the fluid from the inner ends of said cylinders and at the same time admit uid into their outer ends; and a cable passing over said pulleys and adapted to be taken up through the outward movement of said pistons, substantially as described.

2. The combination of a pair of connected cylinders; a pair of oppositely-acting pistons, each carrying a pulley at its outer end; a fluid-supply chamber; a valve-seat between said cylinders having a pair of fluid-supply ports, one of said supply-ports communicating with the inner ends of both of said cylinders, and the other communicating with the outer ends ot' both of said cylinders; a pair of exhaust-ports; a valve-plate adapted to shut oft the fluid-supply chamber from either or both of said fluid-supply ports, said valveplate having an opening adapted to connect either of the supply-ports with the duid-'supply chamber, and having a pair of pockets to be taken 11p through the outward movement of said pistons, substantially as described.

3. The combination of a pair of connected cylinders; a pair of oppositely-acting pistons;

a fluid-supply chamber; a valve communieating with both the inner and outer ends of said cylinders, and adapted to exhaust the fluid at the outer ends of said cylinders, and at the same time admit iiuid into their inner ends, and to exhaust the duid from the inner ends of said cylinders and at the same time admit duid into their outer ends, substantially as described.

4. The combination of a pair of connected cylinders; a pair of oppositely-acting pistons; a Huid-supply chamber; a valve-seat between said cylinders having a pair of fluid-supply ports, one of said supply-ports communicating with the inner ends of both of said cylinders, and the other communicating with the outer ends of both ot said cylinders; a pair of exhaust-ports; a Valve-plate adapted to shut off the fluid-supply chamber from either or both ot' said duid-supply ports, said valveplate having an opening adapted to connect either of the supply-ports with the {luid-supply chamber, and having a pair of pockets each adapted to establish communication between one of said supply-ports and one of said exhaust-ports, and suitably arranged so that when one of said supply-ports is in communication with the duid-supply chamber, the other of said supply-ports will be in communication with its respective exhaust-port, substantially as described.

5. The combination of a pair of oppositelydisposed connected cylinders provided with a hanger adapted to support same in a substantially horizontal position; a pair ot' oppositely-acting pistons, each carrying a pulley at its outer end; a duid-'supply chamber; a valve adapted to establish communication between said fluid-supply chamber and the inner ends of said cylinders or between said duid-supply chamber and the outer ends4 of said cylinders, and being adapted to exhaust the duid at the outer ends of said cylinders when such communication is established with their inner ends, and to exhaust the fluidsupply from the inner ends of said cylinders when said communication is established with their outer ends; and a cable passing over both of said pulleys and having a depending port adapted to be taken up through the outward movement of said pistons, substantially as described.

6. The combination of a pair of connected cylinders; a pair of oppositely-acting pistons; a duid-supply chamber; the connection between said cylinders providing a valve-seat adapted to support a rotary valve-plate, said valve-seat havinga pair of Huid-supply ports and a pair of exhaust-ports; one of said supplyports communicating with the inner ends of both of said cylinders and the other communieatin g with the outer ends of both of said cylinders; a valve-plate journaled in said valveseat and adapted to shut off the duid-supply chamber from either or both of said supplyports, having an opening adapted to connect either of said supply-ports with the duid-sup- IOO IIO

ply chamber, and having a pair of pockets each adapted to establish communication be- .tween one of said supply-ports and one of the other of said supply-ports Will be in communicatiou with its respective exhaust-port, substantially as described.

7. In a hoist, the combination of a portably- "suspended frame; a pair of oppositely-mov able members, each lhaving a pulley at its outer end; a pair of pulleys journaled on said frame independently of said movable members anda cable passing over both puljleys on said movable members and having each of its ends passing over one of the other pulleys anddepending therefrom in suitable `manner to have said ends raised through the outward movement of said movable members; and means for simultaneously moving said members in opposite directions relatively of said frame, substantially as described.

8. In a hoist, the combination of a portablysuspended frame; a pair of oppositely-mov- `able members on said frame, each movable relatively of said frame, toward and away from each other, and each having a pulley. at one end; a cable passing over both of said pulleys and having tsends depending from said frame'and adapted to be raised through the opposite movement of said members; and means for simultaneously moving said members in opposite directions relatively of said frame, substantially as described.

V9. In a hoist, the combination of `a frame;

` a pair of oppositely-movable members on said frame, each movable relatively of said frame, toward and away from each other, -and each having a pulley at one end; a pair of pulleys journaled on said frame independently of said movable members; a cable passing over bothpulleys on said movable members and having each of its ends passing over one of the other pulleys and depending therefrom in suitable manner to have said ends raised through the opposite movement of said movable members; and means for simultaneously moving said members in opposite directions relatively of said frame, substantially as described.

Signed at Chicago this 17th day of November,` 1902.

GEORGE C. HUNTER.

Witnesses: i

BLANCHE MICHAEL, WM. R. RUMMLER. 

